The OdorGuard Plus Product Line has been expanded to include 1-inch, 2-inch and 4-inch pleated filters with absorbent loadings of 125, 250 and 375 grams per square foot of filter area, respectively. The Plus pleats offer equal volumes of 60 percent activated carbon and activated alumina impregnated with 5 percent potassium permanganate. According to the company, this blend of adsorbents will remove a wide range of odors and light gases, including ammonia, formaldehyde, hydrogen sulfide and sulfur dioxide. Each filter is available in standard and special sizes.

D-Mark Inc., 25712 D'Hondt Court, Chesterfield, MI 48051; (800) 343-3610; fax (586) 949-4181;